This is only speculation but I think it is possible that there was a general instruction to paint white patches on diffs (meaning REAR diffs) but that some squaddies, having been programmed to do what they were told and not to think too much, got carried away and painted them on front diffs as well.
Certainly you never see convoy lights to illuminate the front diff.
I think white front diffs is not correct practice although certainly was sometimes done.
David
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